The combo is infinite squirrels - get 1 first time, then 2, then 3, then 4, and so on. More if you manage to give all your creatures haste by some enchantment. In fact, infinite in one turn if you can give all your creatures haste by an enchantment. Squirrel Mob gets +1/+1 for every other squirrel on the field. So, that's an infinite/infinite creature for a total of 8 mana, plus the aforesaid haste enchantment.